Solid NaCl is heated with K2Cr2O7 and concentrated H2SO4. The orange-red vapours evolved are of

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Solid $NaCl$ is heated with $K X_{2} Cr X_{2} O X_{7}$ and concentrated $H X_{2} SO X_{4}$ . The orange-red vapours evolved are of

K X_{2} Cr X_{2} O X_{7} + 4 NaCl + 6 H X_{2} SO X_{4} \to 2 KHSO X_{4} + 4 NaHSO X_{4} + 2 CrO X_{2} Cl X_{2} + 3 H X_{2} O

. Chromyl chloride is volatile and orange-red; chromium stays in the

+ 6

state (this is not a redox reaction).